R3154 Voltage Detector

Nisshinbo Micro Devices' R3154 advanced voltage detector serves automotive, industrial, and other safety-critical applications that need to provide a high level of reliability. Conventional voltage detectors usually monitor the power supply of low-voltage processors and share the same power source. In case of failure or slow start of this power source, the voltage detector will not operate or become unstable. The design of the R3154 has been enhanced and offers several important benefits:

1. The supply and the measuring pins are separated, this makes the voltage detector more flexible to measure a voltage within the circuit and at a very low sense voltage level

2. It has a wide operating voltage range and therefore it can be powered directly from car batteries and function independently from the power source for the processor

3. A built-in voltage regulator stabilizes voltage fluctuations of a car battery, even during a tough cranking condition

4. The test pin makes it possible to verify the correct functioning of the monitoring circuit periodically

5. Thanks to the high accuracy of the sense and hysteresis voltage levels, a monitoring circuit can be created that meets the tolerance range of the MCU's supply voltage

The R3154 monitors with high accuracy for excessive increases or decreases in the processor power supply to detect system malfunction at an early stage. This is especially important for safety-critical applications and automotive systems requiring fault detection including ECU, ADAS, and control units including EV inverters and charge controllers.

There are several product versions available with internally set monitoring threshold voltage settings, which can be specified in 0.01 V increments. An active reset delay time can be set using an external capacitor. The output is an N-channel open drain version. The R3154 is available in four different quality grades targeting consumer, industrial, and automotive markets (AEC-Q100 compliant soon). The robust SOT-23-6 package and the high withstand voltage of pins are specially designed to prevent damage to the chip in the event of a short circuit between adjacent pins.